键盘更改(例如从NumberPad更改为Default)时是否发送任何通知? [英] Is there any notification that gets sent when the Keyboard changes (like from NumberPad to Default)
问题描述
我试图弄清楚如何在键盘改变时得到通知.我想做的是将DONE按钮添加到4&类型的键盘上. 5(NumberPad和PhonePad),一切正常,除了当我使用默认KB类型从TextField过渡时,没有触发KeyboardDidAppear的通知.
I am trying to figure out how I can get notified when the keyboard changes. What I am trying to do is add a DONE button to keyboard of type 4 & 5 (NumberPad and PhonePad), everything is working fine, except when I transition from a TextField using a Default KB type, The notification that the KeyboardDidAppear isn't being fired.
这就是我得到的:
- (void)viewDidLoad
{
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardDidShow:)
name:UIKeyboardDidShowNotification
object:nil];
}
然后,我为当前的KB类型和正在编辑的当前TextField添加了一个属性:
Then I added a Property for the current KB type and the current TextField being edited:
#pragma mark - Delegate Methods
-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
self.currentKBType = textField.keyboardType;
self.curTextField = textField;
return YES;
}
然后我根据当前的KB类型决定是否添加该DONE按钮:
I then make a decision on whether or not to add that DONE button based on the current KB type:
- (void)keyboardDidShow:(NSNotification *)note {
if (self.currentKBType == 4 || self.currentKBType == 5) {
[self addButtonToKeyboard];
}
}
问题在于,显示键盘时会触发通知,但更改时不会触发(从一个TextField过渡到指定另一个KB类型的另一个TextField.
Problem is that the notification fires when the keyboard is displayed, but not when it changes (transitions from one TextField to another that specifies a different KB type.
有什么建议吗?我想念什么吗?
Any suggestions? Am I missing something?
推荐答案
知道了这一点.采取了一些逻辑,但它可以完美地工作.这是我所做的: 为以下项添加了私有属性:
Got this figured out. Took a little logic, but it works flawlessly. Here is what I did: Added private properties for:
@property (nonatomic) UIKeyboardType currentKBType;
@property(nonatomic,strong) UITextField *curTextField;
@property(nonatomic,strong) UIButton *doneButton;
@property(nonatomic) BOOL doneButtonDisplayed;
然后在两个TextField委托方法中添加了以下逻辑:
Then added the following logic in the both the TextField delegate method:
-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
self.currentKBType = textField.keyboardType;
if (textField.keyboardType == 4 || textField.keyboardType == 5) {
if (!doneButtonDisplayed) {
[self addButtonToKeyboard];
}
} else {
if (doneButtonDisplayed) {
[self removeButtonFromKeyboard];
}
}
self.curTextField = textField;
return YES;
}
然后在我在viewDidLoad中为VC签名的KeyboardDidShowNotification中:
And in the KeyboardDidShowNotification that I signed the VC up for in the viewDidLoad:
- (void)keyboardDidShow:(NSNotification *)note {
if (self.currentKBType == 4 || self.currentKBType == 5) {
if (!doneButtonDisplayed) {
[self addButtonToKeyboard];
}
} else {
if (doneButtonDisplayed) {
[self removeButtonFromKeyboard];
}
}
}
以及这些方法中引用的两种方法:
And the two methods referenced in these methods:
- (void)addButtonToKeyboard {
// create custom button
doneButton = [UIButton buttonWithType:UIButtonTypeCustom];
doneButton.frame = CGRectMake(0, 163, 106, 53);
doneButton.adjustsImageWhenHighlighted = NO;
[doneButton setImage:[UIImage imageNamed:@"DoneNormal.png"] forState:UIControlStateNormal];
[doneButton setImage:[UIImage imageNamed:@"DoneHL.png"] forState:UIControlStateHighlighted];
[doneButton addTarget:self action:@selector(resignKeyboard) forControlEvents:UIControlEventTouchUpInside];
// locate keyboard view
if ([[[UIApplication sharedApplication] windows] count] > 1) {
UIWindow* tempWindow = [[[UIApplication sharedApplication] windows] objectAtIndex:1];
UIView* keyboard;
for(int i=0; i<[tempWindow.subviews count]; i++) {
keyboard = [tempWindow.subviews objectAtIndex:i];
// keyboard found, add the button
if([[keyboard description] hasPrefix:@"<UIPeripheralHost"] == YES) {
[keyboard addSubview:doneButton];
self.doneButtonDisplayed = YES;
}
}
}
}
- (void)removeButtonFromKeyboard {
[doneButton removeFromSuperview];
self.doneButtonDisplayed = NO;
}
最后,每当触摸完成"按钮时就会调用resignKeyboard方法:
And finally, the resignKeyboard method that is called whenever the Done button is touched:
-(void)resignKeyboard {
[self.curTextField resignFirstResponder];
self.doneButtonDisplayed = NO;
}
这将在显示NumberPad或PhonePad类型的键盘时添加该完成"按钮,并将其(仅在已添加时)从其他键盘类型中删除.
This will add that Done button whenever a NumberPad or PhonePad type keyboard is displayed and remove it (only when it has been added) from the other keyboard types.
经过测试,效果很好.
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